![](data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" viewBox="0 0 72 71" width="72"></svg>)
There is a curve in the shape of an arc, as shown in the figure. The length of the curve is 12M, and the center angle of the arc is 81 °. Find the radius r of this arc as __ (accurate to 0.1M)
According to the meaning of the question, 12 = 81 × π × R
180，
The solution shows that r = 8.5 (m)
So the answer is: 8.5m
There is a curve in the shape of an arc with a length of 12m. The center angle of the arc is 81 degrees. Find the radius r of this arc Do you have anything more detailed
81/360*2*3.14*R=12
R is approximately equal to 8.5
The arc length is equal to the circumferential angle of the radius. What is the arc degree
Arc length formula: l = a * r
A here is the central angle of the arc length
A = 1 can be obtained from the meaning of the question
So the circumference angle = 1 / 2
Definition: the central angle of the arc whose arc length is equal to the radius of the circle is 1 radian. Who can help me explain this sentence - I'm Xiaobai
You must first admit that the ratio of any circle circumference to radius is a constant = 2 π. It is easy to prove that π is a fixed value in advanced mathematics. Divide the circumference of the whole circle into 360 parts, of which the arc length of one part corresponds to the circle center angle of 1 °, and the whole circle corresponds to 360 °, which is the angle defined by the angle system. In this way, the angle of 1 ° corresponds to 2 π R
What are the arc radius r, arc degree a, arc length L and T in the drawing Thank you! I'm here for track laying. Usually, the slope change point has an arc. For example; r=15000 a=16°t=2108 L=4189。
T is the tangent length
The length from the starting point of the arc to the intersection of the extension line connecting the midpoint of the arc and the center of the arc
The arc length is 1800 and the distance from the arc length to the chord top is 275. How to calculate the radian
The arc length is C = 1800, and the distance from the chord to the arc top is h = 275. How many radians is the center angle a?
The arc radius is r
Rn+1=(1-(Rn*COS(C/(2*Rn))-Rn+H)/((C/2)*SIN(C/(2*Rn))-H))*Rn
R0=1400
R1=1423.6
R2=1424.38
R3=1424.38
R=1424.38
A=C/R
=1800/1424.38
=1.26371 radians
RELATED INFORMATIONS
- 1. Arc length equals________ The central angle of the circle opposite the arc of is called the angle of 1 radian
- 2. An ant starts from a, crawls along the polygon for a week and returns to point a, then vector AB + vector BC + vector CD + vector de + vector EF + vector FG + vector GA = ()
- 3. It is known that the edge length of regular tetrahedron a-bcd is a (four faces are congruent regular triangles), e and F are the midpoint of edges BC and ad respectively. Find the angle formed by EF and ab
- 4. The radius of the circle is 240mm. How many degrees is the center angle of the circle opposite to the arc with a length of 500mm on the circle? Why is the answer only positive
- 5. A construction company wants to build an arc-shaped curve with a radius of 30m. The center angle of the arc-shaped curve is 120 °, then the length of the curve is? (π takes 3)
- 6. Given that the chord length of the center angle with radian number 2 is also 2, the arc length of the center angle is () A. 2 B. 2sin1 C. 2sin-11 D. sin2
- 7. Radian system formula about sector arc length and area formula? Derivation formula?
- 8. As shown in the figure, points e, F, G and H are the midpoint of edges AB, BC, CD and Da of parallelogram ABCD respectively Verification: △ bef ≌ △ DGH
- 9. 2. Let a be m × N matrix, B is n × M matrix, and m < n, ab = I is known, where I is an m-order identity matrix. It is proved that the column vector group of B is linear
- 10. Given that a = √ 2, B = 3, the included angle between a and B is 45 °, find the vector a+ λ B and λ When the included angle of a + B is an acute angle, λ Value range of
- 11. Using the arc length formulas under angle system and radian system respectively, the length of the arc corresponding to the 60 ° center angle in a circle with a radius of 1m is calculated
- 12. It is known that the arc length of an arc is equal to the side length of the inscribed regular triangle of its circle, then the radian number of the center angle of the arc is __
- 13. How many radians is the center angle of a string with a length equal to 3 times the root of the radius Trouble = give me the process
- 14. On a circle with a radius of 25mm, if the length of an arc is 50mm, the radian number of the center angle of the arc is (). For detailed explanation,
- 15. On a circle with a known radius of 120 mm, the length of an arc is 144 mm. Find the radians of the center angle of the arc Answer: |a| = 144 / 120 = 1.2, so the radian number of the center angle is 1.2 Because there is a formula, l = |a|r: the arc length is equal to the absolute value and half of the center angle (the number of radians) of the arc Product of diameters So in this question, should the answer be that the radian number of the center angle is 1.2 or - 1.2? The question does not say whether the positive angle or the negative angle should be taken into account
- 16. If the arc length of the center angle of 1 radian is equal to 2, the chord length of the center angle is equal to?
- 17. In a circle with a radius of 2, the number of radians of the center angle of the arc with an arc length of 1 is _
- 18. In a circle, the number of radians of the center angle of an arc with an arc length equal to 3 times the root of the radius is
- 19. What is the arc length of a circle with a radius of 1 and a center angle of - 3 radians?
- 20. (Lesson 11 10) on a circle with a known radius of 120mm, the length of an arc is 144MM. Find the radians of the center angle of the circle